Json在Ansible中解析 [英] Json parsing in Ansible

问题描述

我必须解析以下命令的输出:

I have to parse the output of the following command:

mongo <dbname> --eval "db.isMaster()"

其输出如下:

 {
    "hosts" : [
        "xxx:<port>",
        "xxx:<port>",
        "xxx:<port>"
    ],
    "setName" : "xxx",
    "setVersion" : xxx,
    "ismaster" : true,
    "secondary" : false,
    "primary" : "xxx",
    "me" : "xxx",
    "electionId" : ObjectId("xxxx"),
    "maxBsonObjectSize" : xxx,
    "maxMessageSizeBytes" : xxxx,
    "maxWriteBatchSize" : xxx,
    "localTime" : ISODate("xxx"),
    "maxWireVersion" : 4,
    "minWireVersion" : 0,
    "ok" : 1
}

我需要解析上面的输出以检查"ismaster"的值是否正确.请让我知道我怎么能做到这一点.

I need to parse the above output to check the value of "ismaster" is true. Please let me know how i can do this in ansible.

此刻，我只是使用以下代码检查文本"ismaster":true是否显示在输出中:

At the moment i am simply checking that the text "ismaster" : true is shown in the output using the following code:

  tasks:
     - name: Check if the mongo node is primary
       shell: mongo <dbname> --eval "db.isMaster()"
       register: output_text

     - name: Run command on master
       shell: <command to execute>
       when: "'\"ismaster\\\" : true,' in output_text.stdout"

但是，最好使用Ansible的json处理进行检查.请告知.

However it would be nice to use Ansible's json processing to check the same. Please advise.

推荐答案

有很多有用的

There are quite a bit of helpful filters in Ansible.

尝试:when: (output_text.stdout | from_json).ismaster

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